Focus On The Middle Dot
Another one...
If you take a look at the picture above, it's not animated. It's your eyes that make it move. Test it out for yourself. Stare at one spot for a couple seconds and everything will stop moving, then look at the black center of each circle and it will stop moving. But move your eyes to the next black center circle and the previous one will move after you take your eyes away from it.
Maybe some clever person can explain how this works.
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